1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Quadcopter or drone robots designing

  1. Apr 4, 2015 #1
    Hello everyone !

    Its very first post here & with the go i want to know about basic reasons behind the liftup of quadcopters or drone going popular these days.

    Is it
    the propeller designing
    motor weight & speed
    battery power
    etc ??

    please explain :smile:
  2. jcsd
  3. Apr 4, 2015 #2


    User Avatar

    Staff: Mentor

    Welcome to the PF.

    It helps us a lot if we know what reading and research you've done so far. Can you post links to reading you have done so far, and ask specific technical questions about that reading? Thanks! :smile:
  4. Apr 5, 2015 #3
    no nothing :biggrin: i just read about various propeller designs
    some are making it with soft drink cans & so & so
    i saw parrot AR prop.
    I got so many things on net but want to know about deep theoritical designings
  5. Apr 9, 2015 #4
    I have once fabricated (not designed but yet I had to analyse the given blueprint) a qaudrotor. In our design, it is the propeller design and rotation which is responsible for the lift. The lift generated depends on the angular velocity (## \omega ##) of propellers. This lift is mainly due to the reaction forces applied by air on propellers when the propellers push air downwards. The ## \omega ## of the propellers are set as such that the angular momentum of the system is conserved with respect to it's centre of gravity and your quadrotor is in rotational equilibrium. This results in lifting off of the quadrotor. You simply have to maintain the ## \omega ## if you wish to keep your device at a certain height. ## \omega ## depend on the configuration of motor and battery employed in your device and this angular velocity (of each propeller) can be varied. (all you need is a transceiver set-up and a little knowledge of coding). Now by varying this ##\omega ## you can tilt your quadrotor in desired direction (pitch, roll or yaw) and the movement is taken care of by the reaction forces. For example if you wish to move your quadrotor forward, all you need to do is set the angular velocities such that the quadrotor tilts in forward direction (pitch down) and the reaction forces from air will push your quadrotor forward.
  6. Apr 9, 2015 #5


    User Avatar
    Gold Member

    Apropos, today's WSJ has an article and interview with the "father of [copter] drones", explaining the innovations that made the popular

  7. Apr 12, 2015 #6


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    It's a huge subject covering many different sciences.

    To hover the rotor(s) must generate as much lift as the drone weighs. To do that they must accelerate air downwards (F=m*a). They can do that with a large slow rotor or a small high speed rotor. In general large blades are more efficient than small ones which is why real helicopters use relatively few large blades not lots of small ones. Model drones are probably relatively inefficient.

    They are popular because they are a lot easier to fly than a conventional model helicopter. Most/many use contra rotating blades so that the pilot doesn't have to deal with the changing torque reaction that a helicopter pilot has to manage.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook